太阳系模型——OpenGL

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OpenGL红宝书中一个例子——太阳系模型

先粘上源码：

#include "stdafx.h"
#define GLUT_DISABLE_ATEXIT_HACK

#include<windows.h>
#include<GL/gl.h>
#include<GL/glu.h>
#include<GL/glut.h>

static int year = 0, day = 0;

void init()
{
glClearColor(0.0,0.0,0.0,0.0);
glShadeModel(GL_FLAT);
}

void display()
{
   glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0,1.0,1.0);
   glPushMatrix();
   glutWireSphere(1.0,20.,16);
glTranslatef(2.0,0.0,0.0);
   glRotatef((GLfloat)day,0.0,1.0,0.0);
glutWireSphere(0.2,10,8);
glPopMatrix();
glutSwapBuffers();
}

void reshape(int w,int h)
{
glViewport(0,0,(GLsizei)w,(GLsizei)h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.0,(GLsizei)w/(GLsizei)h,1.0,20.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0.0,0.0,5.0,0.0,0.0,0.0,0.0,1.0,0.0);
}

void keyboard(unsigned char k, int x, int y)
{
switch(k){
  case 'd':
   day = (day+10)%360;
   glutPostRedisplay();
   break;
  case 'D':
   day = (day -10) % 360;
            glutPostRedisplay();
   break;
  case 'y':
   year = (year + 5) % 360;
            glutPostRedisplay();
   break;
  case 'Y':
   year = (year - 5) % 360;
            glutPostRedisplay();
   break;
  default:
   break;
}
}

int main(int argc, char** argv)
{
glutInit(&argc,argv);

glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutInitWindowSize(500,500);
glutInitWindowPosition(100,100);
glutCreateWindow(argv[0]);
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutMainLoop();
return 0;
}

由于最开始用的是_tmain()，编译出现了从“_TCHAR *[]”转换为“char **”出错。这个是2005默认的"使用 Unicode 字符集"，解决是

"配置属性"——>"字符集"——>"使用多字节字符集"。

如果是用 main()，无需改动，改为多字符集反而出错。

改正后没有错误。但是在运行时出现找不到MSVCR80D.dll提示。解决方案：

1．在“属性->配置属性->清单工具->常规“下有一个”使用FAT32解决办法。（注意：一定要先配置这个选项，然后再编译工程，要不然还是不好用：）

2．找到你的工程的文件夹，如（myproject），找到其下的myproject/myproject/Debug/ myproject.rec，把它删掉（删掉整个Debug目录也可以），重新编译，搞定！

http://www.cppblog.com/LiBerTine/archive/2009/09/21/73323.html

最后效果如附件。

glutKeyboardFunc(void (GLUTCALLBACK *func)(unsigned char key, int x, int y));

x，y显示鼠标位置

glutKeyboardFunc sets the keyboard callback for the current window. When a user types into the window, each key press generating an ASCII character will generate a keyboard callback。

http://www.opengl.org/resources/libraries/glut/spec3/node49.html